Add license_type field to METADATA

Change-Id: Id44338303c0dc35434ce3de55c4213334dd8f0f3
diff --git a/METADATA b/METADATA
index 84def66..f7694a0 100644
--- a/METADATA
+++ b/METADATA
@@ -13,4 +13,5 @@
   }
   version: "ebfdd37d831fbafe11aba84141c7e4e90a555f4a"
   last_upgrade_date { year: 2017 month: 10 day: 30 }
+  license_type: NOTICE
 }